Criminal Profiling: Part 1 History and Method
An Early Case: The Vampire of Sacramento
Ressler says it was the first time he was able to go on-site with a profile, and he was ready. He offers a step-by-step method analysis for how he derived the traits he lists. For example, from a psychiatric study of body type and mental temperament hed read, he decided the offender was scrawny. Given the disorder at the scene, it was likely that the UNSUB did not have a career or much education - nothing that required organized thinking and concentration. The profile was all a matter of logic and knowledge about principles of human behavior, which Ressler was able to fully explain to anyone who asked. Vorpagels profile was similar.
Ressler figured the UNSUB for a disorganized killer as opposed to an organized one, with clues pointing toward the possibility of paranoid psychosis. He clearly had not planned the crime and did little to hide or destroy evidence. He left footprints and fingerprints, and had probably walked around oblivious to the blood on his clothing. In other words, he gave little thought to the consequences. His domicile would be as sloppy as the place he had ransacked, and his mental capacity was likely screwed up. That meant he probably did not drive a car, indicating he lived in the vicinity of the crimes. He was white, 25-27, thin, undernourished, lived alone, and probably had evidence that pointed to the crime in his home. He was likely unemployed and the recipient of disability money. All of this was derived from known information that such crimes tended to be intra-racial, specific to a certain age range, and similar to other people with a paranoia-based mental illness. From what Ressler knew, it was also likely that this offender would kill again, and keep on killing until he was caught. They had to work fast.
Vorpagel faced this man in the interrogation room, and Chase admitted he had committed the murders, but had done nothing wrong. He was saving his own life, because his blood was turning to sand and he needed theirs to prevent it. Talking to someone like Chase helped to confirm what the profilers thought, and it was cases such as this that gave Ressler an idea.